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- W3105655502 abstract "We aim to probe the mass of SL2S,J02140-0535, a galaxy group at $z$ = 0.44 from the Strong Lensing Legacy Survey (SL2S). We combine strong lensing modeling and dynamical constraints. The strong lensing analysis is based on multi-band HST/ACS observations exhibiting strong lensing features that we have followed-up spectroscopically with VLT/FORS2. To constrain the scale radius of an NFW mass profile that cannot be constrained by strong lensing, we propose a new method by taking advantage of the large-scale dynamical information provided by VLT/FORS2 and KECK/LRIS spectroscopy of group members. In constrast to other authors, we show that the observed lensing features in SL2S,J02140-0535 belong to different background sources: one at $z$ = 1.7 $pm$ 0.1 produces three images, while the other at $z$ = 1.023 $pm$ 0.001 has only a single image. Our unimodal NFW mass model reproduces these images very well. It is characterized by a concentration parameter $c_{200}$ = 6.0 $pm$ 0.6, which is slightly greater than the value expected from $Lambda$CDM simulations for a mass of M$_{200}$ $approx$ 1 $times$ 10$^{14}$ M$_{sun}$. The spectroscopic analysis of group members also reveals a unimodal structure that exhibits no evidence of merging. We compare our dynamic mass estimate with an independent weak-lensing based mass estimate finding that both are consistent. Our combined lensing and dynamical analysis of SL2S,J02140-0535 demonstrates the importance of spectroscopic information in reliably identifying the lensing features. Our findings argue that the system is a relaxed, massive galaxy group where mass is traced by light. This work shows a potentially useful method for constraining large-scale properties inaccessible to strong lensing, such as the scale radius of the NFW profile." @default.
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- W3105655502 date "2011-02-08" @default.
- W3105655502 modified "2023-10-18" @default.
- W3105655502 title "Gravitational lensing and dynamics in SL2S J02140-0535: probing the mass out to large radius" @default.
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- W3105655502 doi "https://doi.org/10.1051/0004-6361/201014965" @default.
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